US20180228770A1 - Formulation for soft anticholinergic analogs - Google Patents

Formulation for soft anticholinergic analogs Download PDF

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Publication number
US20180228770A1
US20180228770A1 US15/746,358 US201615746358A US2018228770A1 US 20180228770 A1 US20180228770 A1 US 20180228770A1 US 201615746358 A US201615746358 A US 201615746358A US 2018228770 A1 US2018228770 A1 US 2018228770A1
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Prior art keywords
composition
hyperhidrosis
subject
reduced
compound
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US15/746,358
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Nicholas S. Bodor
John J. Koleng
David Angulo
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Bodor Laboratories Inc
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Bodor Laboratories Inc
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Priority claimed from US14/805,114 external-priority patent/US20150320722A1/en
Application filed by Bodor Laboratories Inc filed Critical Bodor Laboratories Inc
Priority to US15/746,358 priority Critical patent/US20180228770A1/en
Assigned to BODOR LABORATORIES, INC. reassignment BODOR LABORATORIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BODOR, NICHOLAS S., ANGULO, DAVID, KOLENG, JOHN J.
Publication of US20180228770A1 publication Critical patent/US20180228770A1/en
Priority to US16/704,736 priority patent/US10952990B2/en
Abandoned legal-status Critical Current

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    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
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    • C07D207/12—Oxygen or sulfur atoms

Definitions

  • Muscarinic receptor antagonists are frequently used therapeutic agents that inhibit the effects of acetylcholine by blocking its binding to muscarinic cholinergic receptors at neuroeffector sites on smooth muscle, cardiac muscle, and gland cells as well as in peripheral ganglia and in the central nervous system (CNS).
  • CNS central nervous system
  • side effects which can include dry mouth, photophobia, blurred vision, urinary hesitancy and retention, drowsiness, dizziness, restlessness, irritability, disorientation, hallucinations, tachycardia and cardiac arrhythmias, nausea, constipation, and severe allergic reactions, often limit their clinical use.
  • Topical administration of anticholinergic agents to targeted areas, such as sweat glands, where the localized blockage of muscarinic receptors will be of clinical benefit, would be a desirable therapeutic strategy.
  • topical anticholinergics can exhibit unwanted systemic side effects which can limit the dosage that can be safely administered.
  • Glycopyrrolate is among the quaternary ammonium anticholinergics which have reduced CNS-related side effects as they cannot cross the blood-brain barrier; however, because glycopyrrolate is eliminated mainly as unchanged drug or active metabolite, its topical administration is often associated with common undesirable anticholinergic systemic side effects.
  • the soft drug approach has been applied in a number of different designs starting from various lead compounds, but there is a need for yet other new soft anticholinergics with clinically meaningful biological activity.
  • novel muscarinic antagonists just as all other soft drugs, are designed to elicit their intended pharmacological effect at the site of application, but to be quickly metabolized into their designed-in, inactive metabolite upon entering the systemic circulation and rapidly eliminated from the body, resulting in reduced systemic side effects and an increased therapeutic index.
  • Soft anticholinergic zwitterions have been described in US Patent Publication No. 2012/0141401 (now U.S. Pat. No. 8,568,699), and its related patents, U.S. Pat. Nos. 8,071,693; 7,538,219; and 7,417,147.
  • Soft anticholinergic esters have been described in US Patent Publication No. 2012/0177590 (now U.S. Pat. No. 8,628,759) and its related patents U.S. Pat. Nos. 8,147,809; 7,576,210; and 7,399,861.
  • Hyperhidrosis is an idiopathic pathological condition characterized by excessive, uncontrollable sweating beyond that required to cool the body. A hyperfunction of the sweat glands and a disturbance of their cholinergic stimulation have been described as possible causes of this condition. It is known to affect approximately 3% of the population. Hyperhidrosis not only may result in intense social embarrassment, but also may even interfere with a person's occupation.
  • Hyperhidrosis most often involves one or several areas, especially the hands, axillae, feet or face, although it can even involve the whole body. Axillary hyperhidrosis is the most common form, followed by palmar hyperhidrosis. Antiperspirants alone are generally not effective in treating this excessive perspiration. Oral medications are occasionally beneficial, but may have side effects. Other therapeutic alternatives include surgical procedure such as endoscopic thoracic sympathectomy. Although the surgery affords permanent benefit in some 40% to 90% of affected individuals, it is invasive, requires general anesthesia and is not without potential side effects. As many as 50% of persons who have undergone thoracic sympathectomy develop compensatory and annoying sweating of the trunk or thighs.
  • Botulinum A neurotoxin which blocks the action on sweat glands of acetylcholine that is released by the autonomic nerves, has proven effective in hyperhidrosis. Minute amounts of BOTOX injected into the palms or axillae of affected individuals result in statistically significant benefit. The effect lasts for several months but requires repeated injections and is often not a suitable alternative for pediatric patients. Iontophoresis has limited efficacy and cannot be used for axillary areas.
  • Topical formulations comprising soft anticholinergic analogs, such as soft ester analogs of glycopyrrolate, have been previously proposed for use in treating hyperhidrosis; however, stable, pharmaceutically acceptable formulations of such esters which can meet regulatory requirements or provide commercially viable shelf-life for such products have been elusive.
  • a stable, pharmaceutically acceptable, and commercially viable formulation for a topically administered composition comprising a soft anticholinergic analog have been previously proposed for use in treating hyperhidrosis; however, stable, pharmaceutically acceptable formulations of such esters which can meet regulatory requirements or provide commercially viable shelf-life for such products have been elusive.
  • a composition herein comprises at least one soft anticholinergic agent, which is a soft ester analog of glycopyrrolate, in an effective amount or concentration that can inhibit excessive perspiration resulting from a condition such as hyperhidrosis.
  • a topical composition comprising: (a) at least one compound having the formula (1):
  • said compound having the R, S, or RS stereoisomeric configuration at the 2 position and 1′ and 3′ positions, or being a mixture thereof, and (b) anhydrous ethanol, provided that said topical composition is anhydrous.
  • One preferred embodiment of a topical composition comprises: (a) at least one compound having the following stereospecific formula (2):
  • said compound having the R stereoisomeric configuration at the 2 position and having the R, S, or RS stereoisomeric configuration at the 1′ and 3′ positions (designated by asterisks), or being a mixture thereof, and (b) anhydrous ethanol, provided that said topical composition is anhydrous.
  • Topical pharmaceutical composition comprising (a) one or more compounds of the foregoing formula (2), (b) anhydrous ethanol and (c) one or more pharmaceutically acceptable carriers or excipients, provided that said topical composition is anhydrous.
  • a topical composition comprising (a) and (b) above; (c) optionally, at least one gelling or viscosity controlling ingredient; and (d) optionally at least one additional carrier or excipient; provided that said topical composition is anhydrous and comprises from about 1% to about 25% of the compound of formula (2), said composition having greater storage stability compared to a composition comprising an aqueous solvent or aqueous buffer.
  • a composition of the subject application can be formulated as a solid or semi-solid, powder, gel, cream, lotion, foam, solution, suspension, aerosol, patch, wipes or emulsion, or the like, and is formulated for topical application for the treatment, inhibition or amelioration of hyperhidrosis. More preferably, a composition as defined above is formulated as an anhydrous ethanol topical gel, which can provide certain advantages, including superior stability or increased shelf-life for the composition, as well as the benefit of minimizing or eliminating the need for a separate preservative in the composition.
  • Topical anhydrous ethanol gel composition herein include properties such as fast drying time, limited residue on the skin or clothing, and facilitation of a capability to be dispensed in metered amounts of product per application.
  • a particular formulation can further mask stickiness properties that some soft anticholinergics, such as certain compounds described herein, may have.
  • One formulation comprises about 0.1% to about 30% of the compound in 70-99.9% of the non-aqueous solvent, ethanol.
  • the formulation can further include one or more additional carriers or excipients, including a gelling or viscosity controlling excipient, which itself is anhydrous, that is non-aqueous.
  • the compounds of formulas (1) and (2) are ethyl esters.
  • esters these compounds are subject to transesterification, which is the process of exchanging the alkyl group of the ester with the alkyl group of an alcohol/alkanol. This reaction is catalyzed by acid or base or even enzymatically.
  • transesterification can lead to an interchange of a significant amount of the drug's ester group for a less desirable, less biologically acceptable group.
  • use of anhydrous methanol as solvent for the ethyl ester leads to unacceptable formation of a significant amount of methyl ester mixed with ethyl ester.
  • anhydrous ethanol leads only to formation of ethyl ester as a product of transesterification. Further, by using anhydrous ethanol, and by making certain that the composition itself is anhydrous, it is possible to avoid hydrolysis of the active ingredient's ethyl ester group.
  • a method for treating, inhibiting or ameliorating hyperhidrosis in a subject which comprises:
  • said compound having the R, S or RS stereoisomeric configuration at the 2 position and 1′ and 3′ positions, or being a mixture thereof; (b) anhydrous ethanol;
  • a method for treating, inhibiting or ameliorating hyperhidrosis in a subject which comprises:
  • said compound having the R stereoisomeric configuration at the 2 position and the R, S, or RS stereoisomeric configuration at the 1′ and 3′ positions, or being a mixture thereof, (b) anhydrous ethanol; (c) optionally, at least one gelling or viscosity-controlling ingredient; and (d) optionally, at least one additional carrier or excipient; provided that said topical composition is anhydrous; and
  • the method can provide reduction of excessive sweating for up to about 48 hours.
  • topical administration of the composition can unexpectedly provide a reduction in sweat production, as compared to baseline conditions, for at least about six (6) hours by an amount which is substantially equivalent to the reduction of sweat production resulting from administration of a composition comprising an equivalent concentration of glycopyrrolate, also compared to baseline conditions.
  • Soft ester analogs of glycopyrrolate were previously believed to require up to 5-10 times the concentration of glycopyrrolate to provide substantially equivalent activity.
  • a preferred method of treating hyperhidrosis in a subject in need of same or for treating, inhibiting or ameliorating excessive sweating therein comprises administering the instant composition in accord with the methods of U.S. patent application Ser. No. 14/213,242.
  • the composition as defined herein comprising a compound of formula (2) above is administered to skin of a subject suffering from hyperhidrosis, before bedtime, such that, compared to untreated, baseline conditions, sweat production is reduced by at least 25% for at least six (6) hours; and such that sweat production is reduced by an amount substantially equivalent to an amount that sweat production is reduced as compared to untreated, baseline conditions, following administration of a composition comprising the same concentration of glycopyrrolate, and with an improved safety profile compared to topical glycopyrrolate.
  • the present method is preferably carried out by topically administering the composition to a human subject, to the skin of the subject at a superficial anatomic area in need of sweat reduction.
  • the anatomic area for application or administration of the composition is selected from a hand palm area, a foot plantar area, a groin area, an axilla area, and a facial area of the subject.
  • the subject method can reduce sweat production by about 25% to about 99%, preferably by about 30% to about 90%, more preferably by at least 50%, which can be a clinically significant endpoint for an indication for treating hyperhidrosis.
  • the method can employ the composition formulated as a solid or semisolid, powder, gel, cream, lotion, foam, solution, suspension, aerosol, patch, wipes or emulsion, or the like and can comprise from about 0.1% to about 30% concentration of the compound, preferably from about 1% to about 25% concentration of the compound, more preferably about 1% to about 20% concentration of the compound, and most preferably about 2% to about 10% concentration of the compound of formula (1) above, preferably of formula (2).
  • a method in accordance with the present description can comprise topically administering to a subject as needed (pm), a composition as defined herein.
  • Administrations are preferably at least one time per week, more preferably at least three to four times per week (e.g., every other day), or can be administered more frequently such as once daily (QD), for example, before bedtime (typically, at night) or after the subject awakens (typically in the morning, and preferably after a bath or shower); twice daily (BID), e.g., every 10-12 hours; thrice daily (TID), e.g., every 6-9 hours; four times daily (QID), e.g., every 3-5 hours; with a preferred upper limit of about 6-8 doses or applications per day.
  • QD once daily
  • TID thrice daily
  • QID times daily
  • the subject method after single or multiple applications, can reduce sweat production for a period of from about 4 hours to about 24 hours, and preferably for a period of from about 6 hours to about 12 hours.
  • a preferred composition herein comprises:
  • the subject formulation is preferably a gel. Accordingly a more preferred composition comprises:
  • the soft glycopyrrolate analog of formula (1) or (2) is a soft anticholinergic ethyl ester.
  • the use of the matching non-aqueous solvent ethanol avoids mixtures of esters which can result from transesterification when an alcohol such as methanol is used as solvent for the ethyl ester. Moreover, the absence of water results in much greater storage stability.
  • anhydrous ethanol can provide for a self-preserving composition, which can provide microbial stability to the composition without added preservatives.
  • Anhydrous ethanol can also inhibit bacterial growth and provide deodorant properties to the composition.
  • a further advantage of a composition according to the present description is provided by the fact that the non-aqueous solvent, anhydrous ethanol, is volatile, especially at localized temperatures generated by body heat so that, when it is topically applied to a subject, it provides a rapidly drying composition.
  • a preferred gelling or viscosity controlling agent can be a modified cellulose, e.g., hydroxypropyl cellulose (HPC), such as the commercially available KLUCELTM, which can preferably provide viscosity of the composition of from about 100 to about 10,000 cps.
  • HPC hydroxypropyl cellulose
  • the terms “comprise(s)” and “comprising” are to be interpreted as having an open-ended meaning. That is, the terms are to be interpreted synonymously with the phrases “having at least” or “including at least”.
  • the term “comprising” means that the process includes at least the recited steps, but may include additional steps.
  • the term “comprising” means that the composition includes at least the recited features or components, but may also include additional features or components.
  • consists essentially of or “consisting essentially of” have a partially closed meaning, that is, they do not permit inclusion of steps or features or components which would substantially change the essential characteristics of a process or composition; for example, steps or features or components which would significantly interfere with the desired properties of the compounds or compositions described herein, i.e., the process or composition is limited to the specified steps or materials and those which do not materially affect the basic and novel characteristics of the process or composition.
  • variable can be equal to any values within that range.
  • the variable can be equal to any integer value of the numerical range, including the end-points of the range.
  • the variable can be equal to any real value of the numerical range, including the end-points of the range.
  • a variable which is described as having values between 0 and 2 can be 0, 1 or 2 for variables which are inherently discrete, and can be 0.0, 0.1, 0.01, 0.001, or any other real value for variables which are inherently continuous.
  • treating means reducing, hindering or inhibiting the development of, controlling, inhibiting, alleviating and/or reversing the symptoms in the individual to which a composition comprising a compound of formula (1) or (2) has been administered, as compared to the symptoms of an individual not being administered the compound or composition.
  • a practitioner will appreciate that the combinations, compositions, dosage forms and methods described herein are to be used in concomitance with continuous clinical evaluations by a skilled practitioner (physician or veterinarian) to determine subsequent therapy. Such evaluation will aid and inform in evaluating whether to increase, reduce or continue a particular treatment dose, and/or to alter the mode of administration.
  • the subject compounds or compositions can also prevent the symptoms, or prevent the occurrence of the symptoms, in the individual to which a composition comprising a compound of formula (1) or (2) above has been administered, as compared to the symptoms of an individual not being administered the compound or composition.
  • This is not a prevention of hyperhidrosis or excessive sweating in the absolute sense, it does not prevent the medical condition, as it does not even address the condition's cause; rather it inhibits the manifestation of the condition for the period of time (hours) for which the administered dose is effective.
  • the methods described herein are intended for use with any subject/patient that may experience their benefits.
  • the terms “subjects” as well as “patients,” “individuals” and “warm-blooded animals” include humans as well as non-human subjects, such as animals that may experience excessive sweating.
  • the compound has the R, S, or RS stereoisomeric configuration at the 2 position and at the 1′ and 3′ positions, or is a mixture thereof.
  • said compound having the R stereoisomeric configuration at the 2 position and the R, S, or RS stereoisomeric configuration at the 1′ and 3′ positions (designated by asterisks), or being a mixture thereof.
  • the above compounds (i)-(viii) can be used alone or two or more of the above compounds can be used in combination in a single composition.
  • Various methods of making the instant compounds are described in the art.
  • An anticholinergically effective amount of such an agent inhibits the effect of acetylcholine by blocking its binding to muscarinic cholinergic receptors at neuroeffector sites.
  • Subjects in need of a method of eliciting an anticholinergic response are those suffering from conditions which respond to treatment with an anticholinergic agent, including subjects suffering from excessive sweating or hyperhidrosis.
  • the compound of formula (1) or (2) is typically administered in the form of a pharmaceutical composition
  • a pharmaceutical composition comprising an anticholinergically effective amount of the compound, anhydrous ethanol and a non-toxic pharmaceutically acceptable carrier or excipient, provided that the composition itself is also anhydrous.
  • Pharmaceutically acceptable carriers, or diluents are well-known in the art.
  • the carriers may be any inert material, organic or inorganic, powders, liquid, or gases suitable for administration, such as: alcohol such as hexylene glycol, gelatin, gum arabic, lactose, microcrystalline cellulose, starch, sodium starch glycolate, calcium hydrogen phosphate, magnesium stearate, talcum, colloidal silicon dioxide, and the like, provided that the ingredients are anhydrous.
  • compositions herein is an anhydrous formulation.
  • anhydrous is meant the ordinary scientific meaning of the word, that is, that no water or aqueous excipient is added to the formulation.
  • compositions may also contain conventional additives such as solvents, stabilizers, wetting agents, emulsifiers, buffers, binders, disintegrants, fragrances, lubricants, glidants, antiadherents, propellants, and the like, just so long as the additives and compositions are anhydrous, that is, free of water to the extent required to avoid significant negative impact on the storage stability of the composition (by hydrolysis of the ester drug).
  • solvents such as solvents, stabilizers, wetting agents, emulsifiers, buffers, binders, disintegrants, fragrances, lubricants, glidants, antiadherents, propellants, and the like.
  • the active ingredient is dissolved in anhydrous ethanol as a solvent, in which the compound is soluble or at least slightly soluble. It is preferred that the apparent pH of the composition be acidic (i.e. apparent pH ⁇ 7).
  • composition herein can be formulated as a solid, semi-solid, or liquid, such as in the form of powders, solutions, lotions, creams, gels, semi-solid sticks, foams, sprays, aerosols, solutions, suspensions or emulsions, patches, wipes and the like, and is formulated for topical administration.
  • a topical preparation formulated as an anhydrous antiperspirant stick, gel, spray, cream, solution, foam, emulsion or the like can be preferred.
  • the active compound In preparing a formulation, it may be necessary to mill the active compound to provide the appropriate particle size prior to combining with the other ingredients.
  • the active compound can be milled to a particle size of less than 200 mesh.
  • suitable topical carriers or excipients to be added to the compound of formula (1) or (2) in absolute ethanol, include alcohols such as hexylene glycol and propylene glycol, dimethicone, e.g. dimethicone 350 cSt, dimethicone copolyol, Dimethiconol Blend 20, dimethiconol 20 cSt, cyclomethicone, e.g.
  • the formulations can additionally include: lubricating agents such as talc, magnesium stearate, and mineral oil; wetting agents; emulsifying and suspending agents; and preserving agents such as methyl- and propylhydroxy-benzoates.
  • lubricating agents such as talc, magnesium stearate, and mineral oil
  • wetting agents such as talc, magnesium stearate, and mineral oil
  • emulsifying and suspending agents such as methyl- and propylhydroxy-benzoates.
  • preserving agents such as methyl- and propylhydroxy-benzoates.
  • composition may additionally contain one or more optional additives such as colorants, perfumes, or the like.
  • optional additives such as colorants, perfumes, or the like.
  • each of these optional additives should be compatible with the active compound.
  • Compatible additives are those that do not prevent the use of or result in the degradation of the compound in the manner described herein.
  • liquid formulation dosages are expressed based on a percent solution (g/100 ml) or percent concentration (w/v) unless otherwise stated.
  • percent concentration can be expressed as mg/mg, or w/w concentrations unless otherwise stated.
  • a person of ordinary skill in the art would readily understand the percent concentration in the context of the type of formulation described.
  • a therapeutically effective or anticholinergically effective amount of a compound of formula (1) or (2) herein is from an about 1% solution (10 mg/ml) to an about 30% solution (300 mg/ml).
  • the topical composition dose is from about 1% concentration to about 25% concentration, or more preferably from about 1% concentration to about 20% concentration, especially from 2% to 10%, and is most preferred using a dose application volume of approximately 0.5 to about 1.0 ml or 2.0 ml of a composition comprising about 3% to about 6%, e.g., about 5%, of the compound per treated area.
  • the exact dosage of a compound in the instant composition can vary depending on its potency, the mode of administration, the application area, the age and weight of the subject and the severity of the condition to be treated.
  • the daily dosage may be administered singly or multiply one to four times daily or more.
  • Administration prior to bedtime does not imply at night or a particular hour or time of day; rather, before or prior to bedtime means that the composition is preferably administered, generally within about 1-2 hours prior to a person's normal rest or sleep (typically 4 to 10-hour) period.
  • a before bedtime administration time can provide a preferred response or activity of the active compounds of formulas (1) and (2), in accord with the method of prior copending U.S. patent application Ser. No. 14/213,242.
  • compositions as described herein can provide a substantially identical or similar clinical (sweat reduction) response in a subject, as compared to administration of a composition containing the same concentration of glycopyrrolate.
  • results of this discovery are surprising in view of previously published mydriatic studies which suggested that the subject compounds in a composition were required to be present in concentration from 5 times to 10 times the concentration of a glycopyrrolate composition exhibiting a similar or substantially identical clinical response.
  • administration of a second dose within about 6-10 hours following the initial dose can also be a preferred method of administration or dosing regimen.
  • the topical composition for treating hyperhidrosis can be a liquid solution, semi-solid, or solid. Solutions are prepared in the usual way, e.g. with the addition of excipients as well as the anhydrous ethanol solvent and can include preservatives such as p-hydroxybenzoates, or stabilizers such as alkali metal salts of ethylenediamine tetraacetic acid, optionally using emulsifiers and/or dispersants, and other organic solvents may optionally be used as solvating agents or dissolving aids, and transferred into vials, ampules, bottles, tubes, syringes, or the like.
  • preservatives such as p-hydroxybenzoates, or stabilizers such as alkali metal salts of ethylenediamine tetraacetic acid, optionally using emulsifiers and/or dispersants, and other organic solvents may optionally be used as solvating agents or dissolving aids, and transferred into vials, ampules
  • the anhydrous composition can have the advantage of minimizing, or eliminating, the need for an additional preservative to be included in the formulation.
  • a composition is a substantially “preservative-free” composition.
  • preservative-free is meant that the composition, although containing ethanol and even possibly another organic solvent which may provide some preserving properties, has no additional preservative component, added specifically for its preservative property to the composition.
  • Additional carriers or excipients may be used in a composition herein, including, for example, pharmaceutically acceptable organic solvents such as paraffins (e.g. petroleum fractions), vegetable oils (e.g. groundnut or sesame oil), mono- or polyfunctional alcohols (e.g. hexylene glycol or glycerol), carriers such as natural mineral powders (e.g. kaolins, clays, talc, chalk), synthetic mineral powders (e.g. highly dispersed silicic acid and silicates), sugars (e.g. cane sugar, lactose and glucose), emulsifiers (e.g.
  • pharmaceutically acceptable organic solvents such as paraffins (e.g. petroleum fractions), vegetable oils (e.g. groundnut or sesame oil), mono- or polyfunctional alcohols (e.g. hexylene glycol or glycerol), carriers such as natural mineral powders (e.g. kaolins, clays, talc, chalk), synthetic mineral powders (
  • lignin e.g. lignin, spent sulfite liquors, methylcellulose, starch and polyvinylpyrrolidone
  • lubricants e.g. magnesium stearate, talc, stearic acid and sodium lauryl sulphate.
  • compositions herein can be formulated using known techniques, and are generally accepted as being formulated with commonly known excipients, including preservatives if needed.
  • soft glycopyrrolate compounds are at least partially water-soluble.
  • soft glycopyrrolates compounds such as soft anticholinergic analogs (e.g., esters) were earlier described as capable of being formulated in buffer (aqueous or water-based) solutions.
  • buffer aqueous or water-based
  • aqueous preparation comprising ascorbic acid was found to produce a pink-colored residue on the skin of individuals after a few to several hours following exposure to the preparation.
  • a preservative-free composition which is also an ascorbic acid-free composition, can therefore provide a further advantage of maintaining a colorless preparation following application and during residence on the skin of a subject.
  • a composition comprising citric acid as an antioxidant/pH adjuster did not result in a pink colored residue following application of the composition to the skin; therefore a composition herein can include citric acid as an antioxidant.
  • HPLC experimental data presented in EXAMPLE 1 below also demonstrate the reduction of hydrolysis products Identified, and increased stability for a product comprising an anhydrous topical gel in accordance with the subject description.
  • Aqueous, or water-based, topical formulations are the most common in view of the availability of gel-forming components which interact with water to form hydrogels.
  • Formulation Solvent Content 100% Water Timepoint Change from Day 7 @ Day 7 @ Baseline Condition Baseline 25° C./60% 40° C./75% (40° C./75%) BBI-4000 1.99% 1.91% 1.80% reduction Assay 9.5% BBI-4000 Main 0 1.90% 7.42% Hydrolysis Products (RRT- 0.79-0.84) Formulation Solvent Content: 60% water, 40% ethanol Timepoint Change from Day 7 @ Day 7 @ Baseline Condition Baseline 25° C./60% 40° C./75% (40° C./75%) BBI-4000 1.99% 1.94% 1.89% reduction Assay 5% BBI-4000 Main 0 0.83% 3.40% Hydrolysis Products (RRT- 0.79-0.84) Formulation Solvent Content: 30% water, 70% ethanol Timepoint Change from Day 7 @ Day 7 @ Baseline Condition Baseline 25° C./60% 40° C./75% (40° C./75%) BBI-4000 1.99% 1.95% 1.89% reduction Assay 5% BBI-4000 Main 0 0.84% 3.50% Hydrolysis
  • Table II shows the components included in an aqueous formulation comprising BBI-4000, a soft anticholinergic ethyl ester, prepared and subjected to hydrolysis and stability testing:
  • Syringe Filter 25 mm, 0.45 ⁇ m, HPF Millex-HV, Millipore or suitable alternative
  • the standards were prepared in duplicate by weighing 2.0 ⁇ 0.1 mg of BBI-4000 into 1 mL volumetric flasks. Dissolved and diluted to volume with acetonitrile and mixed by inversion.
  • Gel samples were prepared in duplicate at a target concentration of 2 mg/mL in a 5-mL volumetric flask. Added 1.5 ml H 2 O and mixed to disperse the sample. Diluted to volume with acetonitrile and filtered an aliquot through a syringe filter.
  • the liquid chromatographic system was set-up as follows:
  • HPLC assay was conducted on formulations at differing pH values, and the results were reviewed for “Time-Zero” and at 7 days at 40° C.:
  • the BBI-4000 content was determined. By Day 7, the assay number decreased, indicating hydrolysis of the BBI-4000 and some hydrolytic degradation products were noticeably increased (the two zwitterion stereoisomers, identified by RRT 0.84 and RRT 0.80), indicating lack of stability of this formulation system. Adjustment of pH, by itself, although providing a lower percent of hydrolytic degradation in the buffered formulation, did not resolve the issue.
  • a second experiment was conducted using a preparation comprising 2% of a soft glycopyrrolate ethyl ester (SGE) in an aqueous buffer system, which was tested for stability at refrigerated, 25° C. (RT), and 40° C., for 7 days, and showed the same trend or similar results.
  • SGE soft glycopyrrolate ethyl ester
  • the SGE is relatively rapidly degraded by hydrolysis and is substantially reduced in less than one week.
  • the anhydrous formulations are based on: ethanol (solvent), hexylene glycol (moisturizer), and hydroxypropyl cellulose (HPC, gelling agent), in varying amounts or ratios.
  • solvent solvent
  • moistureturizer hexylene glycol
  • HPC hydroxypropyl cellulose
  • a 14-day dermal and systemic toxicity and toxicokinetics study in Gottingen Minipigs was conducted and completed using a formulation based on Formulations 79-1 and 84-1, above, but having a relatively high concentration of the active drug for testing tolerability.
  • the composition of the preparation used in this study included BBI-4000 as active ingredient (except in the vehicle-only control), hydroxypropyl cellulose as a gelling agent, hexylene glycol as an emollient, ascorbic acid or citric acid as antioxidant/pH adjuster and ethanol as the anhydrous vehicle.
  • Group 1 Three groups of one male and one female animal were included in the main study, Group 1 receiving vehicle, Group 2 receiving BBI-4000 gel at 10% concentration and Group 3 receiving BBI-4000 gel at 20% concentration. All groups received 2 mL of gel formulation, once a day, for 14 consecutive days, applied to approximately 10% of their body surface area on their backs.
  • composition was well-tolerated, there was no evidence of erythema or edema in the treated skin of any of the animals.
  • Daily observation did not report any abnormality in heart rate or any other parameter.
  • Pupil size assessments were reported as normal at all times in all animals. Blood chemistry and hematology parameters were reported within normal ranges. The necropsy did not reveal any abnormalities in any of the animals.
  • the estimated BBI-4000 dose applied to the skin in this study was 40 mg/kg/day for Group 3 and 20 mg/kg/day for Group 2.
  • KLUCELTM MF hydroxylpropyl cellulose (HPC) is available commercially from a variety of sources.
  • DOW CORNING® DIMETHICONOL BLEND 20 is a unique blend of silicone gum (6%) in dimethicone.
  • BHT is butylated hydroxytoluene also known as dibutylhydroxytoluene.
  • Formulation No. 84-1 Further stability testing has been completed for a 3-month time-frame, using Formulation No. 84-1, tested at three temperatures: accelerated (40° C.), room temperature (25° C.), and refrigerated (about 4° C.).
  • Formulation No. 84-1 was specifically prepared using the following preparation instructions:
  • the formulation 84-1 having the formulation shown in Table VII, showed good stability and was tested in vivo.
  • Study BBI-4000-CL-101 was a Phase 1, randomized, double-blind, vehicle-controlled study of BBI-4000 gel conducted in 24 subjects with axillary hyperhidrosis. The study was conducted at a single center in the Dominican Republic. This study was not conducted under a US IND, but was undertaken in full compliance with applicable regulations of the Dominican Republic and with good clinical practice guidelines.
  • the drug product used in this study was an anhydrous semi-transparent gel with a composition including BBI-4000, hydroxypropylcellulose, hexylene glycol, DIMETHICONOL BLEND 20, citric acid, and ethanol.
  • Cohort 1 6 subjects received 5% BBI-4000 gel in one axilla and vehicle in the other once daily (at night) for 14 consecutive days, based on a randomized, split-body design.
  • Cohort 2 18 subjects (6 in each treatment group) were randomized to receive 5% BBI-4000 gel, 10% BBI-4000 gel, or vehicle (control) to both axillae once daily (at night) for 14 consecutive days, based on a parallel-group design.
  • Subjects were 18 to 45 years of age, in good general health, with a diagnosis of primary axillary hyperhidrosis based on the following criteria at baseline:
  • HDSS Hyperhidrosis Disease Severity Score
  • Efficacy was assessed by the change in gravimetrically measured sweat production and the change in hyperhidrosis disease severity scale (HDSS) from baseline to Day 15 (end of therapy).
  • HDSS hyperhidrosis disease severity scale
  • sweat production was measured by placing filter paper (pre-weighed) on the axilla for 5 minutes while the subject was in a semi-reclining position at room temperature.
  • the filter paper was covered with plastic during exposure to the axilla, and was then weighed following the 5-minute exposure period to calculate the amount of sweat produced.
  • Subjects in Cohort 2 ranged from 18.6 to 43.7 years of age, with a median age of ⁇ 31 years in each treatment group. All subjects were Hispanic/Latino. No imbalances were noted between treatment groups with regard to gender, race, or ethnicity.
  • BBI-4000 formulation showed achievement of a greater reduction in gravimetrically measured sweat production and a greater improvement in HDSS assessments, when compared to vehicle.
  • the overall reduction in sweat production and the HDSS improvement endpoints suggest than BBI-4000 10% gel performed better than BBI-4000 5% gel, it is difficult to make a definitive conclusion regarding differences in the magnitude of effect of the 2 active arms with this small sample size.
  • Results for the key endpoints that have been commonly associated with a clinically meaningful improvement i.e., reduction in sweat product of at least 50% and 2-point improvement in HDSS are here provided for the aggregate number of subjects exposed to BBI-4000 in comparison to vehicle.
  • the proportion of subjects treated with BBI-4000 who had at least a 50% reduction in sweat production at Day 15 was 75% (9 of 12) compared with 33% (2 of 6) of subjects who received vehicle.
  • 8 of 12 (67%) subjects receiving BBI-4000 reported a 2-point improvement in HDSS at Day 15, compared with 2 of 6 (33%) in the vehicle group.
  • This reduction in HDSS score represents a meaningful change from intolerable or barely tolerable hyperhidrosis to tolerable or never noticeable hyperhidrosis for these subjects.
  • the amount of BBI-4000 can alternatively be 5.000% w/w, 15.000% w/w or 20.000% w/w, with the amount of anhydrous ethanol adjusted accordingly.
  • Component Amount BBI-4000 1% to 20% w/w Hexylene Glycol 10% w/w Hydroxypropyl Cellulose 1.25% w/w Citric Acid, Anhydrous 0.001% w/w Dimethiconol Blend 20 or 2.5% w/w Isopropyl Myristate Anhydrous Ethanol qs to 100% w/w Additional preferred embodiments include dimethicone or cyclomethicone, separately or in combination, in place of Dimethiconol Blend 20, optionally together with isopropyl myristate, in the above formulation.
  • isopropyl myristate is preferred over Dimethiconol Blend 20 for two reasons.
  • the first reason is related to transfer and scale-up of manufacturing process. It has been found difficult to stabilize the droplets of Dimethiconol Blend 20 in the formulation when attempting to increase the batch size and transfer the manufacturing process. Over time, a small amount of Dimethiconol Blend 20 coalesces at the bottom of the container in small droplets. The change to isopropyl myristate (IPM) eliminates this.
  • the second reason is related to FDA acceptance of Dimethiconol Blend 20. While Dimethiconol Blend 20 is an acceptable ingredient in cosmetic preparations, it has not been previously approved in pharmaceutical formulations.
  • isopropyl myristate eliminates the need to conduct this additional testing as IPM has been approved in other pharmaceutical preparations, Dimethiconol Blend 20 was not detrimental to the function of the formulation; however, isopropyl myristate provides benefits to scale-up and commercialization. After evaluating a number of alternatives, isopropyl myristate was selected based upon its ability to reduce tack during drying as well as provide similar in vitro permeability. It also provided a formulation with a similar chemical stability profile to Dimethiconol Blend 20.
  • the isopropyl myristate formulation was compared to the Dimethiconol Blend 20 formulation in a preclinical animal study.
  • the isopropyl myristate formulation demonstrated an increase in permeation in mini-pigs relative to the Dimethiconol Blend 20 formulation.
  • Two upcoming studies in humans are planned. The first study will compare the pharmacokinetics of 5% and 15% BBI-4000 gels containing isopropyl myristate with 15% BBI-4000 gel containing Dimethiconol Blend 20.
  • the second study will evaluate/confirm the efficacy of BBI-4000 gel containing isopropyl myristate.

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